docs: APIs for custom test drivers are highly experimental

* doc/automake.texi (API for Custom Test Drivers): The APIs
described here are not "somewhat experimental", but rather
"highly experimental".  Don't promise the sure a sort of
backward-compatibility that we are very likely not going to
keep.

diff --git a/doc/automake.texi b/doc/automake.texi
index 3c8bf0e49889e544e282e692b518058042a60285..2090f38d42632a04a6d743e4f0f14f1cc61dfbbd 100644 (file)
--- a/doc/automake.texi
+++ b/doc/automake.texi
@@ -9358,9 +9358,10 @@ invocations of @code{@var{ext}_LOG_DRIVER}.
 @node API for Custom Test Drivers
 @subsection API for Custom Test Drivers
 
-Note that @emph{the APIs described here are still somewhat experimental},
-and might undergo changes and tightenings in the future, to accommodate
-for new features or to satisfy additional portability requirements.
+Note that @emph{the APIs described here are still highly experimental},
+and will very likely undergo tightenings and likely also extensive changes
+in the future, to accommodate for new features or to satisfy additional
+portability requirements.
 
 The main characteristic of these APIs is that they are designed to share
 as much infrastructure, semantics, and implementation details as possible